EP 1227365 A1 20020731 - Photographic element with improved sensitivity and improved keeping
Title (en)
Photographic element with improved sensitivity and improved keeping
Title (de)
Photographisches Element mit verbesserter Empfindlichkeit und mit verbesserter Lagerfähigkeit
Title (fr)
Elément photographique à sensibilité améliorée et avec des propriétés de conservation améliorées
Publication
Application
Priority
US 75569001 A 20010105
Abstract (en)
This invention comprises a photographic element comprising at least one light-sensitive silver halide emulsion layer containing a fragmentable electron donating compound of the formula: X-Y' or a compound which contains a moiety of the formula -X-Y'; wherein X is an electron donor moiety, Y' is a leaving proton H or a leaving group Y, with the proviso that if Y' is a proton, a base, beta <->, is present in the emulsion layer, and wherein: 1) X-Y' has an oxidation potential between 0 and about 1.4 V; 2) the oxidized form of X-Y' undergoes a bond cleavage reaction to give the radical X<•> and the leaving fragment Y'; and 3) the radical X<•> has an oxidation potential ≤-0.7V; said photographic element further comprising a reductone of Formula 2: <CHEM> wherein R<23> and R<24> are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as -OH, sulfonamide, sulfamoyl, or carbamoyl, or R<23> and R<24> may be joined to complete a heterocyclic ring, R<21> and R<22> are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 1 or 2 and R<20> is H, alkyl, aryl, or CO2R<25> where R<25> is alkyl.
IPC 1-7
IPC 8 full level
G03C 1/08 (2006.01); G03C 1/06 (2006.01); G03C 1/10 (2006.01); G03C 1/34 (2006.01); G03C 7/392 (2006.01)
CPC (source: EP US)
G03C 1/10 (2013.01 - EP US); G03C 1/34 (2013.01 - EP US); G03C 7/39236 (2013.01 - EP US); G03C 7/39212 (2013.01 - EP US); G03C 7/3924 (2013.01 - EP US); G03C 2200/24 (2013.01 - EP US)
Citation (search report)
- [A] EP 0786691 A1 19970730 - EASTMAN KODAK CO [US]
- [A] EP 0845703 A1 19980603 - EASTMAN KODAK CO [US]
- [A] EP 0845705 A1 19980603 - EASTMAN KODAK CO [US]
- [A] EP 1022612 A1 20000726 - EASTMAN KODAK CO [US]
- [A] EP 0786690 A2 19970730 - EASTMAN KODAK CO [US]
Designated contracting state (EPC)
CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 1227365 A1 20020731; JP 2002214732 A 20020731; US 2003008248 A1 20030109; US 6514683 B2 20030204
DOCDB simple family (application)
EP 01205088 A 20011224; JP 2002000431 A 20020107; US 75569001 A 20010105